etl.hu has no MX records.
Question and response
Question
dig etl.hu. MX
Answer
The response has no answer records.
Authority
The response has no authority records.
Additional
. 0 OPT [{Extended_DNS_Error: PROHIBITED}, {Extended_DNS_Error: NOT_AUTHORITATIVE: recursion disabled}] ; payload 1232, xrcode 0, version 0, flags 0